The route of the 280-truck convoy, which set off from the Moscow region on Tuesday, has been closely followed by journalists, observers and the international community amid fears it is a Trojan horse-style military invasion.

Ukraine has said it will not allow the trucks, escorted by Russian soldiers, to enter its territory. But Moscow-backed rebels are in charge of the Izvarino crossing point, near where the convoy has stopped.

The International Committee of the Red Cross (ICRC), which was informed by Moscow last week of the shipment, said it still had no details of where the convoy was heading. Its destination appears to be Luhansk, one of two major cities still controlled by rebels, and the scene of fierce fighting between the Ukrainian army and separatist forces.